A document detailing the UK's position on the Ukraine crisis has been seen being taken into Downing Street.

It was photographed as an official went into Downing Street for a meeting of the National Security Council as the crisis deepened.

It makes clear the Government is not considering curbing trade with Russia - or closing London's financial centre to Moscow as part of any possible package of sanctions against the country.

The papers also suggest the UK will lobby to exclude any talk of a military response to the deepening crisis.

Sky's Jason Farrell said: "It looks like some kind of a briefing document that's being taken into the meeting.

"It does give away some of Britain's position towards Russia.

Image:The unknown official with the document in Downing Street

"It does suggest there may be suspension of contracts with Russia. There is talk about suspending Russia from the G8 and putting in visa restrictions.

"But it says the UK should not support, for now, trade sanctions or close London's financial centre to Russia.

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"It also talks of what the UK can do for Ukraine - technical assistance packages - ideally jointly with Germany and about the EU working to provide some kind of alternative gas supply if Russia cuts them off."

The document also talks of pushing UN Secretary General Ban Ki-moon "to take the lead in calling and creating a forum for engaging Russia on Ukraine", and accepting "a special European Council" for leaders to meet and discuss the crisis.

It also says the UK should "discourage any discussion" of any "contingency military preparations".

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Farrell added: "It is extremely embarrassing that the points of discussion have come out in this way."

Prime Minister David Cameron said after the meeting Russia would face "diplomatic, political, economic" pressure in response to "violating the sovereignty" of Ukraine.

"What we want to see is a de-escalation rather than a continuation down the path that the Russian government has taken, violating the sovereignty and territorial integrity of another country.

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"So we shall have to bring to bear diplomatic, political, economic and other pressures in order to make this point.

"That is the very clear message the whole world needs to send to the Russian government."

EU leaders are to hold an emergency summit in Brussels on Thursday to discuss the situation in Ukraine.